{"id":18145,"date":"2026-08-28T04:01:42","date_gmt":"2026-08-27T19:01:42","guid":{"rendered":"https:\/\/m365jp.net\/?p=18145"},"modified":"2026-08-28T04:03:42","modified_gmt":"2026-08-27T19:03:42","slug":"servicerestored-ex1458145-exchange-online-users-may-be-unable-to-complete-mailbox-offboarding-because-the-migration-task-is-blocked-and-cant-finish","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-08-28-servicerestored-ex1458145-exchange-online-users-may-be-unable-to-complete-mailbox-offboarding-because-the-migration-task-is-blocked-and-cant-finish","title":{"rendered":"[serviceRestored] EX1458145 | Exchange Online | Users may be unable to complete mailbox offboarding because the migration task is blocked and can\u2019t finish"},"content":{"rendered":"
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EX1458145 | Exchange Online | Users may be unable to complete mailbox offboarding because the migration task is blocked and can\u2019t finish<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceRestored<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may have been unable to complete mailbox offboarding because the migration task is blocked and couldn\u2019t finish.<\/td>\n<\/tr>\n
Last Updated<\/th>\n08\/27\/2026 18:14:36<\/td>\n<\/tr>\n
Start Time<\/th>\n08\/11\/2026 01:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n08\/27\/2026 01:00:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may be unable to complete mailbox offboarding because the migration task is blocked and can\u2019t finish <\/p>\n

User impact: Users may have been unable to complete mailbox offboarding because the migration task is blocked and couldn\u2019t finish. <\/p>\n

Final status: We’ve completed deployment of our fix faster than initially anticipated and validated after a period of monitoring service availability that our actions successfully remediated impact. <\/p>\n

Scope of impact: Users attempting to complete mailbox offboarding in Exchange Online may have been impacted by this issue. <\/p>\n

Start time: Tuesday, August 11, 2026, at 1:00 AM UTC <\/p>\n

End time: Thursday, August 27, 2026, at 1:00 AM UTC <\/p>\n

Root cause: The mailbox migration task was being delayed due to the integrity validation process remaining pending at the completion stage, resulting in impact. <\/p>\n

Next steps:
– We’re analyzing the offending integrity validation process to validate how it was introduced into our service and to confirm what actions we can take to prevent similar impact scenarios from occurring in the future.<\/td>\n<\/tr>\n

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